@book{MSM_1967__163__1_0,
     author = {Minorsky, N.},
     title = {Th\'eorie des oscillations},
     series = {M\'emorial des sciences math\'ematiques},
     publisher = {Gauthier-Villars},
     number = {163},
     year = {1967},
     mrnumber = {221013},
     zbl = {0146.20503},
     language = {fr},
     url = {http://archive.numdam.org/item/MSM_1967__163__1_0/}
}